DE102010014144A1 - Electrical terminal - Google Patents

Abstract

Electrical terminal (1) for the clamping connection of at least one electrical conductor (5) recorded with in an insulating housing (2) contact frame (4), the punched out of a flat metal material, and in the manner of a channel with at least two side walls and a contact base (11) is deformed, wherein the contact frame (4) to form a conductor clamping connector on each side wall in each case a leaf spring (9) in the manner of a punched out of the flat metal part of the tongue has, which is bent out of the plane of the flat metal part, such that the free end of the leaf spring (9) forms a against the electrical conductor (5) directed clamping edge (10) and having formed in the direction of a by the clamping edge (10) nip tapering at least partly funnel-shaped conductor entry section (30), wherein the conductor insertion region (30) in conductor insertion direction of a conductor insertion opening (3) in the insulating housing (2) closes. The at least partially funnel-shaped conductor entry section (30) is circumferentially closed at least virtually and in common from the contact frame (4) and at least partially by the insulating material housing (2) is formed.

Description

• The invention relates to an electrical connection terminal for the terminal connection of at least one electrical conductor with a received in an insulating contact frame which is punched out of a flat metal material and formed in the manner of a channel with at least two side walls and a contact tray, wherein the contact frame to form a conductor clamping connection to each side wall each comprises a leaf spring in the manner of a shaped from the flat metal part of the tongue which is bent out of the plane of the flat metal part, such that the free end of the leaf spring is directed against the electrical conductor terminal edge and with a in the direction of a by clamping edge clamping point formed at least section-wise tapering funnel-shaped conductor entry region, wherein the conductor insertion region adjoins in the direction of conductor insertion of a conductor insertion opening in the insulating housing.
• State of the art
• The DE 197 35 835 B4 discloses an electrical terminal for connection of an electrical conductor with a tunnel-like insertion area at which to join two lateral mutually facing leaf springs for the clamping bracket of the electrical conductor. The nip can be opened by means of a pusher acting from above pushing on is integrally formed on the leaf springs chamfers, so that the conductor can be withdrawn again. Particularly in the area of ​​the leaf springs no sufficient guidance of a conductor to be inserted is provided, so that there may be of the same to an insecure clamping.
• The US 7,513,793 further shows a connecting terminal for an electrical conductor to a plug contact having a substantially cylindrical closed contact frame for receiving the conductor as well as a slot within the cylindrical region. Further, the cylindrical region has a clamping tongue within the slot for clamping the conductor and the cylindrically shaped contact frame is provided with a funnel-shaped insertion portion for the electrical conductor. The contact frame is therefore quite complex.
• Further discloses the US 4,299,436 an attachable to a circuit board connection terminal, which is bent from a one-piece metal part. The terminal is formed as a substantially continuous closed rectangular tubular contact frame with end contact portions toward the circuit board. From the bottom and top of the tunnel-shaped member respectively projects a leaf spring tongue in the direction of the tunnel interior turned off, wherein an electrical conductor may be received clampingly between the ends of the leaf springs, so that given a relatively complex design of the contact frame having a high metallic content here ,
• OBJECT OF THE INVENTION
• The object of the invention is to provide an electrical connection terminal for the connection of an electrical conductor, which ensures a secure clamping of the electrical conductor and at the same time has a simple structure.
• Disclosure of the Invention
• The object is solved by the features of claim 1. After that is received in an insulating housing for an electric terminal for the clamping connection of at least an electric conductor with a contact frame which is formed from a flat metal material (eg. B. punched) and is shaped in the manner of a channel with at least two side walls and a contact tray, wherein the contact frame to form a conductor clamping connector on each side wall in each case a leaf spring in the manner of a shaped from the flat metal part (z. B. punched) comprises tongue which is bent out of the plane of the flat metal part, such that the free end of the leaf spring a counter forming the electrical conductor directed clamping edge and having an at least partially tapering funnel-shaped in the direction of a nip formed by the clamping edge conductor insertion region, wherein the conductor lead-in area in conductor insertion direction of a conductor insertion opening in Isolierstoffgehäu se adjoins, provided that according to the invention the at least partially funnel-shaped conductor entry area is circumferentially closed at least virtually, and that the funnel-shaped conductor entry region is formed together from the contact frame and through the insulating material.
• Characterized in that the funnel-shaped conductor entry area is composed of the insulating material and the contact frame or is formed by these two components, a simple and effective conductor guide is achieved, whereby in particular the contact frame may be very simple, compact and material-saving executed. If needed, the conductor insertion region can thus be varied in a simple manner and be adapted to different requirements, since the two components can be considered separately.
• In a preferred embodiment, the contact frame has a contact base which is bent out of the plane of the flat metal part and conductor insertion direction is inclined with respect to an inserted electrical conductor.
• According to a further preferred embodiment, the insulating material in the region of the conductor lead-in area on an inner housing wall which is inclined in conductor insertion direction against an inserted electrical conductor.
• With this embodiment, the contact base and the housing inner wall can be adjusted separately as part of the funnel-shaped conductor insertion region from each other the required conditions. Thus, the conductor insertion area can viewed in cross section in the area of ​​the contact tray and / or the housing inner wall, for example, straight or curved running, whereby an individual and quick adaptation is possible.
• According to a further preferred embodiment, the contact frame for easy connection of the electrical terminal to a circuit board, for example by means of an SMD soldered joint, two contact regions. With the contact areas a trace on the printed circuit board is at least contacted. The contact areas close These are preferably in the longitudinal extension of the contact frame at its front and rear ends on.
• Preferably, the formation of the clamping edge the free end of the leaf spring is issued directed against the electrical conductor. In this way, there is an optimized terminal connection, because the clamping edge can dig to the electrical conductor by the salaried clamping angle in an optimized manner.
• directed to the outside of the electrical terminal is run-in slope in each case integrally formed on the leaf springs, which are issued in a funnel shape to each other. By means of these chamfers the nip can be opened by the leaf springs can be pressed over the run-up slopes in a simplified manner apart by means of an actuating means. In this way, either inserted electrical conductors can be easily removed or inserted simplified. In particular, stranded conductors can thus be used for this electrical terminal.
• a pusher, wherein the pusher can be pushed over the funnel-shaped to each other exhibited chamfers the contact frame between the leaf springs to open the clamping connection of the electrical conductor by forcing apart of the leaf springs is preferred as the actuating element for opening the terminal point used which is integrally formed on the insulating ,
• In a further preferred embodiment of the contact frame via at least one snap-in connection with the insulating material is connected. In this way, an easy-to-use and durable firm connection between the contact frame and insulating yields.
• To prevent damage, in particular breaking, of the leaf springs and / or of the pusher to effectively avoid an overload protection is provided for this purpose in a preferred embodiment. Advantageously, the deflection of the leaf spring by lateral walls and / or intermediate walls of the insulating housing is limitable. Further advantageously, the limitation of the deflection of the pushing arm of the pusher of the pushing arm by an attachment to at least a leaf spring. These embodiments provide an overload protection without significant adjustments to the electrical terminal and are therefore cost-effective.
• Brief Description of Drawings
• The invention, reference is made in the figures embodiment will be explained in more detail. Show it
• 1 : A terminal according to the invention in the assembly in perspective,
• 2 : An inventive arranged on a printed circuit board connector terminal with inserted conductors without insulating material,
• 3 Is a perspective view of the contact frame,
• 4 Is a perspective sectional view of the invention disposed on a circuit board terminal with inserted electrical conductor,
• 5a A sectional view of the terminal according to the invention according to the section IV-IV of 1 with non-actuated pusher
• 5b A sectional view of the terminal according to the invention according to the section IV-IV of 1 with actuated pusher
• 6a A first perspective view of the insulating housing,
• 6b A second perspective view of the insulating housing,
• 7 A sectional view of the terminal according to the invention according to the section VII-VII of Figure a.
• Embodiment of the invention
• The 1 shows an electrical terminal according to the invention 1 with an insulating material 2 In which a metal contact frame 4 is added. the insulating material 2 has on an end face 19 at least one conductor insertion opening 3 for the insertion of an electrical conductor 5 ( 4 ). In the illustrated embodiment, the terminal 1 Bipolar each having a conductor insertion opening 3 and a contact frame 4 performed per pole. but the terminal can also have any other arbitrary number of poles.
• be seen in the 1 Further, terminal portions 16 the contact frame 4 Having respective contact portions 28 Such. As traces of a circuit board 7 to contact ( 2 ). The connection areas 16 are with the contact portions 28 connected in particular via a solder (SMD soldered connection), but it is also conceivable a plug connection. In the
• 2 is on the board 7 Contact frame held 4 seen. In the illustration has been omitted, the insulating material, so that the connection of the electrical conductors 5 at the contact frame 4 is recognizable. The electrical conductor 5 is an annularly curved, at least almost closed executed channel input 8th the Kontaktrahmes 4 introduced, wherein the stripped end 6 the electrical conductor 5 between the leaf springs 9 formed side walls of the channel-shaped contact frame 4 is added. The leaf springs 9 are bent out of a flat metal part and the free ends form a clamping edge 10 So that the two opposed clamping edges 10 the leaf springs 9 a nip for the electrical conductor 5 form. The area from which the conductor insertion opening 3 subsequent channel input 8th the contact frame 4 up to that of the clamping edges 10 Nip formed defines a conductor insertion region 30 ,
• The structure of the contact frame 4 is in the 3 clearly visible, whereby it is evident that the formation of the clamping edge 10 at the free end of the leaf spring 9 an additional, against the electrical conductor 5 directed exhibition 13 is stamped on or formed, in order to improve the clamping action. Further, the contact frame 4 a contact floor 11 on, which is so found out from the surface of a flat metal part and bent out that this channel from the input 8th in the direction of the nip, ie essentially in the conductor insertion region 30 , Increasing in the direction of an inserted conductor 5 is designed inclined. At the contact floor 11 closes one end at the channel entrance 8th a first contact portion 16 and at the other to a second contact region 16 on. In addition, in 3 the annular channel input 8th integrally formed front latching hooks 14 seen, which for interlocking connection with the insulating material 2 in there next to the conductor insertion opening 3 arranged corresponding front recesses 17 intervention. In the area between the edges by the clamping 10 Terminal point and formed the end remote from the annular channel input rear contact portion 16 are the contact floor 11 rear side of the contact tray 11 arranged detent hooks 15 provided, which from the circuit board 7 or from the contact portions by the 16 plane formed are preferably spaced apart and not shown in recesses of the insulating 2 intervention.
• In the area of ​​the free end of the leaf springs 9 At which each of the clamping edge 10 is formed, the leaf spring 9 each have on their contact floor 10 Longitudinal side facing away from a run-on slope 12 on, each to the outside, or housing top side 18 the terminal 1 is directed. The run-on slopes 12 a contact frame 4 thus together form an upward, from the ground contact 10 facing away from the funnel-shaped receptacle.
• The 4 such as 5a and 5b respectively show a sectional view of the invention from a contact frame 4 and an insulating 2 composite electrical terminal 1 Wherein, in the 4 in addition an attached electrical conductor 5 is shown. In these figures, it can be seen that the housing inner wall 31 has an inclined area, within which the housing inner wall 31 against an inserted conductor 5 is designed inclined. This inclined portion is within the above-defined conductor entry area 30 or can also extend over the entire conductor entry area 30 extend.
• It is in these representations also be seen that the conductor insertion region 30 due to the design of the contact frame 4 with its leaf springs 9 and its contact floor 11 and the housing inner wall 31 the insulating housing 2 has an at least partially funnel-shaped design, wherein it is clear that the funnel-shaped conductor entry area 30 from the contact frame 4 and the insulating material 2 is composed. The funnel-shaped conductor entry area 30 is peripherally at least almost completely closed. Only between the leaf springs 9 and the contact floor 11 on the one hand and the leaf springs 9 and the housing inner wall 31 on the other hand narrow gaps are present. The cross section of the conductor insertion region 30 is executed in the embodiment is substantially rectangular or square, but may also have any other shape, in particular round or at least sections of round or arcuate.
• The funnel-shaped conductor entry area 30 forms to be inserted for an electrical conductor 5 , In particular for the stripped end 6 a guide so that the stripped end targeted the clamping point can be supplied. The electrical terminal 1 is also for stranded electrical conductors 5 used, particularly when the edges by the clamping 10 Clamping point formed by an actuating element which acts as a handle 21 is formed prior to the insertion of the electrical conductor 5 opens. The individual wires of the stranded conductor 5 can due to the peripheral side almost closed conductor entry area 30 not dodge and be sure of the clamping edge 10 clamped. That the conductor insertion opening 3 supplied wande end of the funnel-shaped portion of the conductor lead-in area 30 with the larger cross section may in this case also, if desired, as a stop for the insulated portion of the electrical conductor 5 serve.
• The fact that the funnel-shaped conductor entry area 30 is composed of the insulating material 2 and the contact frame 4 or is formed by these two Baueilen, a simple and effective conductor guide is achieved, whereby in particular the contact frame 4 very simple, can be made compact and material-saving.
• In the 4 . 5a and 5b Furthermore, a handle 21 as an actuating element with a pushing arm 23 recognized that one piece with the insulating housing 2 is executed. the pusher 21 acts on chamfers 12 and presses upon actuation of these chamfers 12 together with the leaf spring 9 , Ie with a pressing with a force F in the direction of the insulating 2 , apart. Thus, the clamping edges 10 the leaf spring 9 pushed apart and the clamping point for the removal of an electrical conductor 5 or for the insertion of an electrical conductor 5 , In particular a multi-stranded conductor 5 open.
• the depressor 23 after, as shown 6a and 6b integrally in the rear of the housing 20 , Preferably in its bottom, the housing top side 18 Half facing away to the insulating 2 formed. the depressor 23 follows the contour of the insulating 2 So that a first of the housing rear wall 20 tailed Drückerarmteil 24 approximately in the plane of the rear side of housing 20 or approximately parallel thereto runs. The contour of the pushing arm 23 follows the further course of the contour of the transition from the rear side of housing 20 the housing top 18 So that a second Drückerarmteil 25 Which with the first Drückerarmteil 24 is connected in one piece approximately in the plane of the housing top 18 or approximately parallel thereto runs. The back 20 and the housing top 18 are arranged at an angle to each other, preferably the rear side of housing 20 and the housing top 18 positioned at least substantially perpendicular to each other. the depressor 23 is thus formed substantially as an angle. At the second Drückerarmteil 25 at its side remote from the first end of an actuating surface Drückerarmteil 27 formed, which is trough-shaped in the present embodiment, but alternatively any other desired shape, such. cross slit shape can be assumed as slot or. It will thus be seen that the pusher 21 in a housing 22 What about rear panel 20 and the housing top 18 is extended arranged. the housing recess 22 is designed primarily as a breakthrough, so that the pusher 21 on the inside of the insulating 2 arranged contact frame 4 can act. the pusher 21 as an actuating element is thus provided with its angled design in the wall or surface of the insulating 2 integrated and represents a portion of the insulating 2 itself represents.
• In the unassembled state, the pusher is 23 or the outer surface substantially in the plane of the surface contour of the insulating 2 Both in the field of housing top 18 and in the area of ​​the rear panel 20 , In the assembled with the insulating material in 2 Contact frame used 4 and non-actuated state is the pusher 21 however, at least relative to the housing top 18 out something like this in 5a is recognizable. The run-on slopes 12 the contact frame 4 lie on the trigger 21 or more specifically at the pusher surface 26 ( 7 ) And direct the pusher 21 outwardly of, so that the pusher 23 stands under a resilient bias. In the 5b the actuated state is shown in which the pusher 21 at an operation force F in the region of trough-like actuating surface 27 is acted upon. It can be seen that the pusher 23 substantially uniformly elastically deformed under the operating force F, the portion of the pusher 21 with the actuating surfaces 26 between the leaf springs 9 dips. the depressor 23 has a substantially uniform thickness or thickness for uniform elastic deformation. During the operation process, ie of pressing the trigger 21 is the pusher 21 from about the housing top 18 shifted protruding position to a position in which the pusher 23 , In particular the second Drückerarmteil 25 In the insulating housing 2 dips. Here, the resilient bias of the pushing arm 23 canceled and the pusher 23 a reverse voltage subjected, so that the pusher arm strives to move outwards again to reach its initial position.
• The 6a and 6b provide the insulating 2 as an individual part is, in particular, the formation of the pusher described 21 and the connection of the pushing arm 23 on the insulating 2 are again clearly visible. Further, it is evident that the insulating 2 at a bottom case each have recesses 32 , into which the contact areas 16 the contact frame 4 engage, such that these contact areas 16 on the rear panel 20 and the housing front 19 with the conductor insertion openings 3 may extend (see also 1 ). At the same time it is achieved that the bottom case of the composite electrical connection terminals forms a substantially flat surface without protruding parts. the insulating material 2 thus in on the PCB 7 arranged state directly to the surface of the printed circuit board 7 rich or on the circuit board 7 rest.
• The 7 again illustrates the operation of the pusher 21 the contact frame 4 , The pusher surface 26 the pusher 21 is substantially wedge-shaped and acts on the corresponding inclined run-on bevels 12 the contact frame 4 , When a load of the pusher 21 with a force F on the actuating surface 27 slide the wedge-shaped pusher surface 26 on the run-on slopes 12 , It emerges between the leaf springs 9 and pushes them apart. As soon as the operating force F from the pusher 21 is removed, press the leaf springs 9 due to its restoring force the pusher 21 on the run-on slopes 12 as well as to corresponding actuating surface 26 back to the starting position.
• The illustrated angular design of the oppressor 21 enables a relatively long effective depressor 23 Accordingly, with a long lever arm, which is especially in confined space, or a very small electrical terminals with small molded insulation beneficial. It is especially in miniaturized terminals by the inventive design of the trigger 21 at all possible, an effective pusher 21 for the actuation of a contact frame 4 provided.
• Because the pusher 23 is subjected in the unactuated state of a bias voltage, with which the pusher can 23 is applied can be kept small. The value of the bias voltage is relatively small, since the displacement of the pushing arm 23 in the unactuated state is also relatively small. The deflection of the pusher arm 23 in the actuated position in the insulating 2 in is not substantially much greater than in the unactuated state, so that the voltages which the pusher is subjected may also be kept relatively small. By contrast, if the entire actuating travel to a voltage-free pusher 23 be abandoned, would be on the pusher 23 voltage acting substantially greater, so that the pusher 23 should as a whole be greater. So, you can see that with the present arrangement, the pusher 21 within the terminal 1 and its interaction with the contact frame 4 , The pusher 21 overall can be kept very small and thus is particularly suitable for very small-sized terminals.
• With the illustrated embodiment, the electrical terminal and an overload protection can be set for the leaf springs 9 as well as the pusher 21 will be realized. as from 7 is seen to be attached to the leaf springs 9 arranged chamfers 12 at a sufficient deflection of the leaf springs 9 on the side walls 33 the insulating housing 2 and / or one or more between the poles of the terminal 1 arranged partitions 34 the insulating housing 2 nudge. The side walls 33 and / or intermediate walls 34 thus limiting a deflection of the leaf springs 9 and so that they are overloaded and thus does not plastically deform or break stop.
• At the same time can also be an overload protection for the pusher 21 be realized or the pusher. Due to the limited deflection of the leaf springs 9 can be between two mutually associated leaf springs only a limited clearance arise. Provided that the maximum width of the portion of the pushing arm 23 Formed between the leaf springs 9 is immersed greater than the gap between the maximum deflected leaf springs 9 , The pusher can 23 are deflected only limited, so that this also to excessive load can be subjected to and breakage of the pushing arm 23 is effectively avoided.
• An overload protection for the pusher 21 or its depressor 23 can also be achieved in that on the between the leaf springs 9 dipping portion of the pushing arm 23 a stop is provided, which at a maximum deflection of the pushing arm or at a maximum depth of immersion of the leaf springs 9 or on the run-on slopes 12 rests, so that a further displacement of the pushing arm is prevented, and damage to the pusher 21 is avoided.
• LIST OF REFERENCE NUMBERS

1

terminal

2

Insulated

3

Conductor insertion opening

4

contact frame

5

electrical conductor

6

stripped end of the electrical conductor

7

circuit board

8th

channel input

9

leaf springs

10

clamping edge

11

Contact floor

12

starting slope

13

Exhibition of the free end of the leaf spring

14

front locking hooks

15

rear locking hooks

16

contact areas

17

front recess

18

Housing top

19

front

20

Case back

21

handle

22

housing recess

23

depressor

24

first Drückerarmteil

25

second Drückerarmteil

26

pusher surface

27

actuating surface

28

Trace contact section

30

Conductor insertion area

31

housing inner wall

32

recess

33

Side wall

34

partition

• QUOTES INCLUDED IN THE DESCRIPTION
• This list of references cited by the applicant is generated automatically and is included solely to inform the reader. The list is not part of the German patent or utility model application. The DPMA is not liable for any errors or omissions.
• Cited patent literature
• DE 19735835 B4 [0002]
• US 7513793 [0003]
• US 4299436 [0004]

Claims (11)

1. Electrical terminal ( 1 ) (For the clamping connection of at least one electrical conductor 5 ) - with (in an insulating 2 ) Contacted frame ( 4 ), Which is formed from a flat metal material, and (in the manner of a channel with at least two side walls and a bottom contact 11 ) Is deformed, - wherein the contact frame ( 4 ) (To form a conductor clamping connector on each side wall in each case a leaf spring 9 ) In the manner of a molded part from the flat metal tongue which is bent out of the plane of the flat metal part, such that the free end of the leaf spring ( 9 ) A (against the electrical conductor 5 ) Directed clamping edge ( 10 ) Forms, and - with a one (in the direction by the clamping edge 10 ) Nip formed (at least partially funnel-shaped conductor entry area 30 ), Wherein the conductor insertion region ( 30 ) (In the direction of conductor insertion of a conductor insertion opening 3 ) (In the insulating 2 ), Followed characterized in that - the at least partially funnel-shaped conductor entry region ( 30 ) Is at least virtually closed circumferential side, and - that the funnel-shaped conductor entry region ( 30 ) Together (from the contact frame 4 ) And (through the insulating 2 ) Is formed.
2. An electrical connecting terminal according to claim 1, characterized in that the contact frame ( 4 ) Having a contact base ( 11 ) Which is bent out of the plane of the flat metal part, and (in conductor insertion direction against an inserted electrical conductor 5 ) Is inclined.
3. An electrical connecting terminal according to claim 1 and 2, characterized in that the insulating housing ( 2 ) (In the region of the conductor lead-in area 30 ) A housing inner wall ( 31 ) Which (in conductor insertion direction against an inserted electrical conductor 5 ) Is inclined.
4. An electrical connecting terminal according to one of claims 1 to 3, characterized in that the contact frame ( 4 ) Two contact areas ( 16 ) (In particular for contacting at least one conductor track 28 ) (On a printed circuit board 7 ) having.
5. An electrical connecting terminal according to one of claims 1 to 4, characterized in that for the formation of the clamping edge (the free end of the leaf spring 9 ) A (against the electrical conductor 5 ) Directed Exhibition ( 13 ) having.
6. An electrical connecting terminal according to one of claims 1 to 5, characterized in that (on the leaf springs 9 ) One (to the outer side of the electrical terminal 1 ) Directed run-on slope ( 12 is formed), which are issued in a funnel shape to each other.
7. An electrical connecting terminal according to claim 6, characterized in that (at the insulating 2 ) A (as suppressors 21 ) Formed actuating element is formed, which (through the funnel-shaped to each other exhibited chamfers 12 ) (Between the leaf springs 9 ) Can be pressed to (the terminal connection of the electrical conductor 5 ) (By pressing apart of the leaf springs 9 ) to open.
8. An electrical connecting terminal according to one of claims 1 to 7, characterized in that the contact frame ( 4 ) Via at least one latching connection ( 14 . 17 ) (With the insulating material 2 ) connected is.
9. Actuating device according to one of claims 1 to 8, characterized in that (for the leaf springs 9 () And / or the pusher 21 ) Is provided an overload protection.
10. Actuating device according to claim 9, characterized in that the deflection of the leaf spring ( 9 ) (By side walls 33 ) And / or intermediate walls of the insulating housing ( 2 ) Can be limited.
11. Actuating device according to claim 9 or 10, characterized in that the displacement of the pushing arm ( 23 ) (By a plant of the pushing arm 23 ) (On at least one leaf spring 9 ) Can be limited.

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